The story
- Proto-Indo-European*né
- Proto-Indo-European*n̥-
- Proto-Germanic*un-
- Proto-West Germanic*un-
- Old Englishun-
- Middle Englishun-
- Englishun-
- Proto-Indo-European*ḱe?
- Proto-Indo-European*ḱóm
- Proto-Italic*kom
- Proto-Italic*kom-
- Latincon-
- Proto-Indo-European*telkʷ-
- Proto-Indo-European*tlokʷetor
- Proto-Italic*tlokʷōr
- Latinloquor
- Latincolloquor
- Latincolloquium
- Middle Englishcolloquies
- Englishcolloquy
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- Englishcolloquial
- English todayuncolloquial
From un- + colloquial.
Etymology from Wiktionary, CC BY-SA 4.0.